Primes, Prime Factorization, GCF, LCM, and Squares

What positive whole number is neither prime nor composite?

Tags

CCSS.4.OA.B.4

What is the only even prime number?

Tags

CCSS.4.OA.B.4

A prime number has exactly ______ factors.

Tags

CCSS.4.OA.B.4

A composite number has...

• 3 or more factors

• exactly 2 factors

• less than 2 factors

• no factors

Tags

CCSS.4.OA.B.4

Which list contains only prime numbers?

• 2, 3, 11, 17

• 5, 7, 13, 21

• 6, 11, 13, 19

• 9, 12, 24, 40

Tags

CCSS.4.OA.B.4

Which number is NOT prime?

• 2

• 3

• 9

• 19

Tags

CCSS.4.OA.B.4

What is the prime factorization of 12?

• $2\times2\times3$

• $2\times3\times3$

• $2\times6$

• $3\times4$

What is the prime factorization of 20?

• $2\times2\times5$

• $2\times10$

• $4\times5$

• $1\times20$

Tags

CCSS.4.OA.B.4

What is the greatest common factor (GCF) of 20 and 26?

What is the least common multiple (LCM) of 3 and 6?

• 3

• 6

• 12

• 18